Improved gas extraction structure adopting downward hole drainage and implementation method thereof

Abstract

The invention discloses an improved gas extraction structure adopting downward hole drainage and an implementation method thereof. The improved gas extraction structure comprises a hole-inside structure (A); the hole-inside structure (A) is communicated with a hole-outside drainage device (B) through hole-inside and hole-outside connecting parts (10); the improved gas extraction structure is characterized in that the hole-inside structure (A) comprises a gas collection chamber (1) and an extraction pipe (8) which are communicated with each other; the gas collection chamber (1) is positioned at the front end of the hole-inside structure (A); the extraction pipe (8) sequentially passes through a Marithan cotton yarn blocking section (4) and a grouting blocking section (6) from one end of the gas collection chamber (1) to be fixed; a drainage pipe (7) is arranged in the extraction pipe (8); the hole-outside drainage device (B) comprises an extraction pipe connection pipe (11) communicated with the extraction pipe (8); the hole-outside length of the drainage pipe (7) is the same as the length of the extraction pipe connection pipe (11); a drainage outlet screw (16) and a drainage outlet nut (17) are arranged at the outer end opening of the drainage pipe (7); and a side surface opening of the extraction pipe connection pipe (11) is communicated with a gas extraction outlet (13) and a compressed air inlet as well as a side flowing hole (14).

Description

technical field [0001] The invention relates to a structure for improving gas drainage through a vertical hole drainage and an implementation method thereof, belonging to the field of coal mine collection. Background technique [0002] The current underground gas drainage drilling holes are classified according to angle: positive hole, negative hole and flat hole. Negative degree holes are also called downholes. Due to the complex occurrence conditions of coal seams, such as inclined coal seams and horizontal coal seams, coal mine gas disasters are serious. As a clean energy source, gas has high utilization value. Gas drainage can not only reduce gas disasters level, and can exploit clean energy, so it is widely used. With the development of society, the demand for energy continues to increase, the depth of coal mine mining is extended and the intensity of mining is increased, mine gas disasters are becoming more and more serious, and the amount of gas emitted from coal min...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to provide a structure and its implementation method for improving gas drainage through downhole drainage, so as to solve the problem that the gas drainage effect is affected by water accumulation in the existing downhole gas drainage process

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